CN1302171A - Electro-acoustic transducer and its producing method - Google Patents
Electro-acoustic transducer and its producing method Download PDFInfo
- Publication number
- CN1302171A CN1302171A CN00137470A CN00137470A CN1302171A CN 1302171 A CN1302171 A CN 1302171A CN 00137470 A CN00137470 A CN 00137470A CN 00137470 A CN00137470 A CN 00137470A CN 1302171 A CN1302171 A CN 1302171A
- Authority
- CN
- China
- Prior art keywords
- magnet
- magnetic
- diaphragm
- magnetic core
- body portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
Abstract
An electroacoustic transducer 1 is constituted by a base 24 formed of magnetic material; a magnetic core 22 formed of magnetic material andprovided erectly on the base 24; a diaphragm 20 formed of magnetic material and supported with an air gap between the diaphragm and a forward end of the magnetic core; a magnet 25 constituting a magnetic circuit together with the base 24, the magnetic core 22 and the diaphragm 20 so as to provide a magnetostatic field; a coil 23 disposed around the magnetic core 22 for applying an oscillating magnetic field to the magnetic circuit; a housing 30 molded integrally with the base 24 and the magnet 25, and so on. The housing 30 has notch holes 38 extending from a bottom surface thereof to the magnet 25.
Description
The present invention relates to one by electromagnetic sound conversion with sonorific electroacoustic transducer, and the method for making this electroacoustic transducer.
Electroacoustic transducer has a magnetic loop, and wherein magnetic field is passed a body portion, a magnetic core and a diaphragm and then got back to magnet from magnet.When an electrical vibration signal offered the coil that is wound in around the magnetic core, an oscillating magnetic field superposition that is produced by coil was in the magnetostatic field of magnetic loop, and the vibration that produces in the diaphragm is passed in the air thus.Thereby generation sound.
The multifrequency nature of electroacoustic transducer, for example acoustic pressure grade, frequency characteristic, conversion efficiency etc. can produce complicated variation because of the assembly precision of its material, accessory size and body portion, magnetic core, diaphragm, magnet etc.Especially, the change in size of air gap has a significant impact the Distribution of Magnetic Field that acts on diaphragm between magnetic core front end and diaphragm.Therefore, strict precision control is necessary concerning air gap.
The present invention's one purpose provides an electroacoustic transducer, and wherein the positional precision of member can improve significantly and can obtain stable properties, and the method for this electroacoustic transducer of manufacturing is provided.
According to the present invention, an electroacoustic transducer is provided, comprising: a panel-shaped base body part of making by magnetic material; One vertically is located at the magnetic core of being made by magnetic material on the body portion; One diaphragm of being made by magnetic material is also supported by an air gap between diaphragm and magnetic core front end; One forms magnetic loop so that the magnet of a magnetostatic field to be provided with body portion, magnetic core and thin slice; One places magnetic core coil on every side to apply an oscillating magnetic field to magnetic loop; And one and the housing parts of body portion and magnet integrated molding, this housing parts has the recess that extends to magnet from its bottom surface.
According to the present invention, because housing parts has the recess that extends to magnet from its bottom surface, magnet comes out by recess and can touch magnet from the outside thus.Thus, the quality control of the location of magnet and position measurement and so on can be carried out in the stage of assembling or detect this electroacoustic transducer.Therefore can realize producing an electroacoustic transducer with stability characteristic (quality).
In addition, the present invention also has the feature that recess can be filled by filler.
According to the present invention, even the recess on the housing parts is intactly kept, in operation, say any problem that also do not have, yet after recess filled out with the material of synthetic resin and so on, characteristics such as the air-tightness of product and durability can be improved all.
In addition, the pedestal that is used to support diaphragm among the present invention is formed at housing parts.
According to the present invention, because the precision that is connected of diaphragm and housing parts can be by the formation pedestal to be improved diaphragm support, so the air gap between diaphragm and the magnetic core front end can keep higher accuracy in housing parts.
In addition, according to the present invention, also provide a method that is used to make an electroacoustic transducer, wherein this transducer comprises: a panel-shaped base body part of being made by magnetic material; One vertically is located at the magnetic core of being made by magnetic material of body portion; One diaphragm of being made by magnetic material is also supported by the air gap between diaphragm and magnetic core front end; Constitute a magnetic loop so that the magnet of a magnetostatic field to be provided with body portion, magnetic core and diaphragm; One places magnetic core coil on every side to apply an oscillating magnetic field to magnetic loop; And one and the housing parts of body portion and magnet integrated molding; The method that wherein is used for making this electroacoustic transducer comprises the steps: body portion and magnet are inserted mould; Pad nail in being located at mould is exerted pressure from the body portion side to magnet, under the situation of inserted mode system housing parts synthetic resin is injected mould whereby.
According to the present invention, insert together with body portion and magnet at housing parts-molded situation under, a pad nail that is used for making the magnet location is arranged in mould, and under the pad nail is pushed down magnet from the body portion side situation injecting synthetic resin.Thus, when synthetic resin flowed into space between body portion and magnet, magnet can not take place to float or position change.Like this, the synthetic resin of q.s can pour in this space.In addition, because the synthetic resin of q.s enters this space, the resin injection pressure distributes or the uniformity in whole resin bed of the stress distribution when hardening of resin.Can prevent that like this body portion owing to irregular pressure produces distortion, can increase substantially the positional precision of each part of magnetic loop thus.Particularly, can make the air gap size between magnetic core front end and diaphragm keep high precision.
In addition, the pad nail preferably removably is connected in mould, even therefore magnet thickness changes according to product specification, the pad nail also can have the different pad nails of adjusting the position by other and replace.
In addition, the present invention has a feature, and promptly its method also comprises a step, i.e. the recess that is formed on housing parts by the pad nail with filler filling one.
According to the present invention, although recess is intactly kept, in operation, do not have any problem yet, yet air-tightness and durability that recess is filled out the back product by the material of synthetic resin and so on all can be improved.
Fig. 1 is the exploded view of expression one embodiment of the invention;
Fig. 2 is the vertical view of housing 30 as shown in Figure 1, is observed by its top.
Fig. 3 is the upward view of housing shown in Fig. 1 30, by its beneath.
Fig. 4 is that electroacoustic transducer 1 cuts open the sectional view of getting along A-A line among Fig. 2.
Fig. 5 A to 5F is that expression one is used for inserting-sectional view of the step of molded shell 30.Wherein, Fig. 5 A to 5C represents the example of a contrast, and Fig. 5 D to 5F represents a preferred embodiment of the present invention.
Fig. 1 is the exploded view of expression a preferred embodiment of the present invention.Top board 10 with a sound release aperture 11 is fixed on the housing that is similar to box 30 flat, the four directions, tubulose in an electroacoustic transducer.In example, this electroacoustic transducer 1 has the width of 7.5mm, the length of 7.5mm and the height of 3mm.
Have a cylindricality magnetic core 22 vertically be located at housing 30 the center.One coil 23 is wound in cylindricality magnetic core 22.One ringshaped magnet 25 partly is embedded in the inwall of housing 30.Magnet 25 and magnetic core 22 coaxial laying.Between magnet 25 and coil 23, determine an annular internal space.
One ring ladder is formed at the upper surface of the inwall of housing 30.One sheet diaphragm 20 is installed on horizontal base 32 and locatees by annular stepped.
Some recesses 31 are formed at the upper surface of housing 30 inwalls respectively, and four protuberances 12 are formed at the lower surface corner part of top board 10 separately.The link position of top board 10 and housing 30 is to adjust by the engagement of the interior corner of recess 31 and protuberance 12.
Provide the terminal 51 that four methods by seam and so on are electrically connected in circuit board on the top of housing 30 outer walls, and further be formed with a communication groove 50, so that the inner surface of housing 30 is communicated with outside air.Housing 30 and top board 10 are to be made by the synthetic resin such as thermoplastic resin.
Fig. 2 is the vertical view of housing 30 as shown in Figure 1, is observed by its top.Fig. 3 is the upward view of the housing 30 among Fig. 1, by its beneath.Fig. 4 is that electroacoustic transducer 1 cuts open the sectional view of getting along A-A line among Fig. 2.
At first, with reference to Fig. 2, the formation position that is used to support the ring-type pedestal 32 of diaphragm 20 is lower than the end face of housing 30 slightly, and the end face present position of ringshaped magnet 25 is lower than pedestal 32.At the housing center, coil 23 place magnetic core 22 around, a panel-shaped base body 24 places the below of magnetic core 22, coil 23 and magnet 25, and the peripheral part of matrix 24 partly is embedded in the inwall of housing 30.At the excircle place of coil 23, the intercommunicating pore 33 and 34 that is used for making the annular internal space of housing 30 to be communicated with external environment condition is formed at the bottom parts of housing 30 and matrix 24 separately.
Below, with reference to Fig. 3, on the position of the bottom surface that is lower than housing 30 slightly, three communication groove 50 are formed at around the intercommunicating pore 33,34.Communication groove 50 is extended to the outer surface bottom of housing 30, and the annular internal space of housing 30 is communicated with external environment condition thus.Matrix 24 partly comes out along intercommunicating pore 33.
In addition, a shrinkage pool 37 is arranged on the housing bottom surface, the formation position of this shrinkage pool 37 is different from the formation position of intercommunicating pore 33, so matrix 24 also comes out by shrinkage pool 37 parts.
Some terminal 51 parts are embedded in corner, the bottom surface part of housing 30 separately, and the embedded part of two terminals 51 of top comes out by notch portion 36 separately.Two terminals 51 half of below are embedded in housing 30 and come out once more near intercommunicating pore 34.The lead-in wire 52 of coil 23 extends the outside via intercommunicating pore 34 and is electrically connected in the expose portion of below two terminals 51 by solder joint 53.Like this, below two terminals 51 are used to provide a drive signal to coil 23, and top two terminals 51 are to strengthen terminal.
In the housing bottom surface, along its circumference trisection, underrun shrinkage pool 38 parts of magnet 25 come out with magnet 25 in the formation of three shrinkage pools 38 in addition.With regard to its upper and lower surface, the shape of matrix 24 be determine and form thus one with magnet 25 bottom surface overlapping areas, should be big as much as possible from the area of this overlapping region of angle of magnetic efficient, and will avoid terminal 51, shrinkage pool 38 and intercommunicating pore 34.
Below, consult Fig. 4, the matrix of being made by magnetic material 24 is embedded in the inner bottom surface of housing 30, and vertically is located on the matrix 24 by the magnetic core 22 that magnetic material is made.Sometimes magnetic core 22 can be used as one pole sheet part and matrix is made of one.
The diaphragm of being made by magnetic material 20 is supported on the circumferential edge part of diaphragm 20 by the upper surface of housing 30 inwalls.One fixing air gap is arranged between the bottom center of diaphragm 20 and magnetic core 22 front ends.One sheet magnetic sheet 21 is fixed in diaphragm 20 end face centers to increase the quality of diaphragm 20.Can improve its air vibration efficient like this.
When provide from circuit board an electrical vibration signal to be wound in magnetic core 22 pass the coil 23 of below two terminals 51 and lead-in wire 52 time, coil 23 effects one oscillating magnetic field is to magnetic loop.Like this, diaphragm 20 is owing to the superposition of oscillating magnetic field is vibrated so that the end face end of diaphragm 20 and the air vibration of bottom end in magnetostatic field.
The end face end and the top flat 10 of diaphragm 20 form a resonant cavity together.When the resonance frequency of the vibration frequency of diaphragm 20 and resonant cavity roughly overlapped, the sound that reaches certain acoustic pressure that is produced was released in the external environment condition by sound release aperture 11.
The sound that results from diaphragm 20 bottom end has the sound opposite phases that produces with the end face end.Therefore must suppress interference to greatest extent to top-face-end sound, therefore, the sound that bottom end produced of diaphragm 20 from the annular internal space of the underrun housing 30 of housing 30, intercommunicating pore 33 and 34 and communication groove 50 be released into the external environment condition.
Fig. 5 A to 5F is that expression one is used for inserting-sectional view of the step of molded shell 30.Wherein, Fig. 5 A to 5C represents analogous cases, and Fig. 5 D to 5F represents a preferred embodiment of the present invention.At first, consult Fig. 5 A, the molded face of mould KA is made end face and the similar shape of inwall with housing 30.The molded face of mould KB is made and the similar shape of the outer wall of housing 30.Distance between mould KA and the mould KB is corresponding with the shape of housing 30.
Molded the shape of mould KA constitutes and magnetic core 22 and matrix 24 location can be located still unmagnetized magnet 25 then.Space between matrix 24 and the unmagnetized magnet 25 is very little, greatly between 0 to 0.8mm.When unmagnetized magnet 25 was made by the agglomerated material of ferrite and so on, the thickness of magnet 25 had the trend that produces considerable variation.The result is exactly, if the thickness low LCL of magnet 25 is big, the space between matrix 24 and the unmagnetized magnet 25 can become big.On the contrary, if the thickness of magnet 25 is excessive, the situation of cracked or matrix 24 distortion of magnet 25 can extruding matrixes 24 takes place in magnet 25 thus when molded.
Next step, with reference to Fig. 5 B, when synthetic resin is injected in the die space, resin since its viscosity almost can't flow in the space between matrix 24 and the unmagnetized magnet 25.In addition because the existence in space, when matrix 24 was subjected to the thrust of the magnet 25 that produced by the resin injection pressure, matrix 24 was out of shape along with the space.Thus, resin solidifies in this case.
Behind the hardening of resin, remove mould.Electroacoustic transducer 1 completes by magnetizing steps such as this magnet 25, treatment coil lead-in wire 52, installation diaphragm 20, connection top board 10.Afterwards, when the mode of electroacoustic transducer 1 by solder reflows and so on was mounted to circuit board, the stress of the matrix 24 that the solder reflows during by welding causes was eliminated and is produced so-called rebound effect.Then, consult Fig. 5 C, the neighboring part of housing 30 is in the bottom end bending, and the pedestal 32 of supporting diaphragm 20 also moves to bottom end.Its result is exactly, and it is littler than the parameter of setting that the air gap G between diaphragm 20 and magnetic core 22 becomes, and the characteristic variations of electroacoustic transducer 1 is very big thus.Main or the major part of this rebound amount depends on the variation of magnet thickness.
As the measure of eliminating this rebound amount, shown in Fig. 5 D, on mould KB, have pad nail KC with unmagnetized magnet 25 still from matrix 24 side pressures to mould KA.In addition, the space between matrix 24 and the unmagnetized magnet 25 approximately is made as 0.4mm and can flows through easily with enough wide resins that makes.
Then,, under this situation, synthetic resin is injected die space, between the space between matrix 24 and the unmagnetized magnet 25, inject the synthetic resin of q.s with reference to Fig. 5 E.Therefore, the mean effort of resin injection pressure is in two opposite faces of matrix 24 thereby can not cause the distortion of matrix 24.In addition, because unmagnetized magnet 25 is by pad nail 25 location, so this unmagnetized magnet 25 can not float or change the position.
After this, remove mould behind hardening of resin, the electroacoustic transducer 1 shown in Fig. 5 F completes by magnetizing steps such as this magnet 25, treatment coil lead-in wire 52, installation diaphragm 20, connection top board 10.Consequently, even matrix 24 is heated by modes such as solder reflows, the residual stress of matrix 24 is zero substantially, and the width that can not produce the air gap G between bounce-back and diaphragm 20 and the magnetic core 22 thus is consistent with set amount.Can improve each parts greatly like this, such as the positional precision of magnet 25, matrix 24 etc., product performance also tends towards stability thus.
In addition, even magnet thickness changes, to such an extent as to the space between matrix 24 and unmagnetized magnet 25 also enough greatly the change of magnet thickness can not produce very big influence.On the other hand, pad nail KC preferably movably is connected in mould, and when magnet thickness changed with product specification, pad nail KC can have the different pad nails of adjusting the position by other and replace thus.
The hole that is produced by pad nail KC forms the shrinkage pool 38 as shown in Fig. 3 and Fig. 4.In addition, in the step of insertion-molded shell, can in mould, provide one be used for fixing matrix 24 and above the pad nail of two terminals 51.The hole that is produced by pad nail KC forms shrinkage pool 36,37.
Even shrinkage pool 36 is intactly kept to 38, in operation, say any problem that also do not have, but by the additional step that shrinkage pool 36 to 38 materials by synthetic resin and so on (preferably with the case material identical materials) are filled out, characteristics such as the air-tightness of product and durability all can be improved.
Carry one in passing, wherein when housing is molded, can insert a unmagnetized magnet although foregoing description is represented an example, however when mould be when making by the nonmagnetic substance such as aluminium, can use a magnetic magnet.
As top described in detail, according to the present invention, a recess is formed at housing parts and is extended to magnet by its bottom surface.Like this, magnet comes out by recess.Consequently can when assembling or detect electroacoustic transducer, carry out such as the location or the quality control the position measurement of magnet.Can realize making an electroacoustic transducer with stability characteristic (quality) like this.
In addition, if recess is filled by the filler of synthetic resin and so on, the air-tightness of product, durability etc. all can be improved.
Also have,,, the pad nail can be arranged in mould under the situation of living magnet from the basal plane side pressure synthetic resin is injected when housing parts is inserted into when molded according to the present invention.Thus, magnet can not float or change the position, and the positional precision of magnet increases substantially.
Claims (5)
1. an electroacoustic transducer is characterized in that, comprising:
The one panel-shaped base body part of making by magnetic material;
One vertically is located at the magnetic core of being made by magnetic material on the described body portion;
One diaphragm of being made by magnetic material is also supported by an air gap between described diaphragm and described magnetic core front end;
Thereby one forms the magnet that a magnetic loop provides a magnetostatic field with described body portion, described magnetic core and described diaphragm;
One places described magnetic core coil on every side to apply an oscillating magnetic field to described magnetic loop; And
One with the housing parts of described body portion and described magnet integrated molding, described housing parts has a recess that extends to described magnet from its bottom surface.
2. electroacoustic transducer as claimed in claim 1 is characterized in that described recess is filled by filler.
3. electroacoustic transducer as claimed in claim 1 is characterized in that, the pedestal that is used to support described diaphragm is formed at described housing parts.
4. a method that is used to make an electroacoustic transducer,
It is characterized in that described transducer comprises:
The one panel-shaped base body part of making by magnetic material;
One vertically is located at the magnetic core of being made by magnetic material on the described body portion;
One diaphragm of being made by magnetic material is also supported by the air gap between described diaphragm and described magnetic core front end;
One forms a magnetic loop and the magnet of a magnetostatic field is provided with described body portion, described magnetic core and described diaphragm;
One places described magnetic core coil on every side to apply an oscillating magnetic field to described magnetic loop; And
One with the housing parts of described body portion and described magnet integrated molding.
It is characterized in that the described method that is used to make described electroacoustic transducer comprises the steps:
Described body portion and described magnet are inserted in the mould; And
Pad nail in being located at described mould is exerted pressure from the body portion side to magnet, under the situation of the described housing parts of inserted mode system, synthetic resin is injected described mould whereby.
5. as the method for manufacturing one electroacoustic transducer as described in the claim 4, it is characterized in that, further comprising the steps of:
The recess that is formed by described pad nail on the described housing parts is filled by filler.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP368032/1999 | 1999-12-24 | ||
| JP36803299A JP3660843B2 (en) | 1999-12-24 | 1999-12-24 | Electromagnetic acoustic transducer and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1302171A true CN1302171A (en) | 2001-07-04 |
| CN1184851C CN1184851C (en) | 2005-01-12 |
Family
ID=18490811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001374702A Expired - Fee Related CN1184851C (en) | 1999-12-24 | 2000-12-21 | Electro-acoustic transducer and its producing method |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6628800B2 (en) |
| EP (1) | EP1111959B1 (en) |
| JP (1) | JP3660843B2 (en) |
| KR (1) | KR100734647B1 (en) |
| CN (1) | CN1184851C (en) |
| DE (1) | DE60035477T2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330774A (en) * | 2007-06-21 | 2008-12-24 | 瑞声声学科技(深圳)有限公司 | Method for assembling electromagnetic audible device |
| CN105120411A (en) * | 2015-09-06 | 2015-12-02 | 袁方舟 | Audio electromagnetic vibrator |
| CN106098047A (en) * | 2016-08-23 | 2016-11-09 | 蒋寅 | A kind of electromagnetic active buzzer and manufacture method thereof |
| CN107847979A (en) * | 2015-07-07 | 2018-03-27 | 罗伯特·博世有限公司 | Sonic transducer |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7277554B2 (en) | 2001-08-08 | 2007-10-02 | Gn Resound North America Corporation | Dynamic range compression using digital frequency warping |
| KR20030083774A (en) * | 2002-04-22 | 2003-11-01 | 남언욱 | Unilateral/Bilateral Electric-Sound Converter Having Fixed Coil Structure Using Magnetization Film and Method Thereof |
| JP3916997B2 (en) * | 2002-04-30 | 2007-05-23 | スター精密株式会社 | Electroacoustic transducer |
| KR20040105556A (en) * | 2004-03-02 | 2004-12-16 | 양호준 | Diaphragm having simple structure, in which permanent magnet is installed in a center of the iron plate |
| JP4522752B2 (en) * | 2004-06-10 | 2010-08-11 | 三菱電機株式会社 | Terminal joining method by soldering |
| US7336198B2 (en) * | 2005-08-12 | 2008-02-26 | The Regents Of The University Of California | Magnetostatic communication |
| KR200408511Y1 (en) * | 2005-11-24 | 2006-02-13 | 부전전자부품 주식회사 | The speaker for using mobile communication terminal |
| US20080080734A1 (en) * | 2006-10-03 | 2008-04-03 | Forth Robert A | Sports audio player and two-way voice/data communication device |
| US8358801B2 (en) * | 2007-02-12 | 2013-01-22 | Robert Katz | Magnetic circuit for electrodynamic moving voice coil actuators |
| JP4875733B2 (en) * | 2009-07-27 | 2012-02-15 | 進 木村 | Movable magnet type speaker and manufacturing method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5492316A (en) * | 1977-12-29 | 1979-07-21 | Seiko Instr & Electronics Ltd | Electromagnetic type electro-acoustic transducer |
| JP2575831B2 (en) * | 1988-07-25 | 1997-01-29 | スター精密 株式会社 | Pronunciation body |
| JPH02268598A (en) * | 1989-04-11 | 1990-11-02 | Matsushita Electric Ind Co Ltd | Low leak magnetic flux type speaker |
| JPH0549082A (en) * | 1991-08-07 | 1993-02-26 | Sony Corp | Speaker equipnent |
| JP2905350B2 (en) * | 1992-11-18 | 1999-06-14 | スター精密 株式会社 | Electroacoustic transducer |
| JP3217962B2 (en) * | 1996-04-04 | 2001-10-15 | スター精密株式会社 | Electroacoustic transducer |
| JP3532715B2 (en) * | 1996-11-20 | 2004-05-31 | スター精密株式会社 | Electromagnetic acoustic transducer |
| JP4024409B2 (en) * | 1998-11-29 | 2007-12-19 | シチズン電子株式会社 | Surface mount electromagnetic sounding body |
-
1999
- 1999-12-24 JP JP36803299A patent/JP3660843B2/en not_active Expired - Fee Related
-
2000
- 2000-12-12 DE DE60035477T patent/DE60035477T2/en not_active Expired - Fee Related
- 2000-12-12 EP EP00311045A patent/EP1111959B1/en not_active Expired - Lifetime
- 2000-12-21 CN CNB001374702A patent/CN1184851C/en not_active Expired - Fee Related
- 2000-12-22 US US09/742,129 patent/US6628800B2/en not_active Expired - Fee Related
- 2000-12-22 KR KR1020000080003A patent/KR100734647B1/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330774A (en) * | 2007-06-21 | 2008-12-24 | 瑞声声学科技(深圳)有限公司 | Method for assembling electromagnetic audible device |
| CN101330774B (en) * | 2007-06-21 | 2013-03-06 | 瑞声声学科技(深圳)有限公司 | Method for assembling electromagnetic audible device |
| CN107847979A (en) * | 2015-07-07 | 2018-03-27 | 罗伯特·博世有限公司 | Sonic transducer |
| US10832646B2 (en) | 2015-07-07 | 2020-11-10 | Robert Bosch Gmbh | Sound transducer |
| CN105120411A (en) * | 2015-09-06 | 2015-12-02 | 袁方舟 | Audio electromagnetic vibrator |
| CN106098047A (en) * | 2016-08-23 | 2016-11-09 | 蒋寅 | A kind of electromagnetic active buzzer and manufacture method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3660843B2 (en) | 2005-06-15 |
| KR100734647B1 (en) | 2007-07-02 |
| CN1184851C (en) | 2005-01-12 |
| DE60035477T2 (en) | 2008-03-13 |
| JP2001186590A (en) | 2001-07-06 |
| EP1111959A2 (en) | 2001-06-27 |
| KR20010062603A (en) | 2001-07-07 |
| DE60035477D1 (en) | 2007-08-23 |
| EP1111959A3 (en) | 2003-01-02 |
| US6628800B2 (en) | 2003-09-30 |
| US20010006488A1 (en) | 2001-07-05 |
| EP1111959B1 (en) | 2007-07-11 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050112 Termination date: 20101221 |